Radar sensor

The radar sensor's compound radome with varying absorber and cover layer thicknesses addresses multibounce reflections, improving performance and accuracy by minimizing reflectivity at different angles, thus enhancing angle finding and field of view.

EP4765494A1Pending Publication Date: 2026-06-24APTIV TECHNOLOGIES AG
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
APTIV TECHNOLOGIES AG
Filing Date
2024-12-20
Publication Date
2026-06-24

AI Technical Summary

Technical Problem

Radar sensors integrated behind vehicle components experience performance degradation due to multibounce reflections and increased side lobes, elevation side lobes, and depolarization effects, which affect angle finding accuracy and field of view.

Method used

A radar sensor design featuring a compound radome with an absorber layer and a cover layer, where the absorber layer has varying thicknesses in primary and secondary regions to minimize reflectivity at different incident angles, reducing multibounce effects and improving angle finding performance.

Benefits of technology

The design reduces disturbing effects on radar sensor performance, enhances angle finding accuracy, and extends the field of view by minimizing reflectivity at multiple angles, while maintaining a compact and efficient manufacturing process.

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Abstract

A radar sensor comprises an antenna layer with antenna elements, and a compound radome including an absorber layer on top of the antenna layer and a cover layer on top of the absorber layer. The absorber layer has a higher electromagnetic absorption than the cover layer. The compound radome comprises a primary region in which the absorber layer has a reference absorber thickness and the cover layer has a reference cover thickness, and a secondary region in which the absorber layer has a secondary absorber thickness and the cover layer has a secondary cover thickness. The secondary cover thickness is different from the reference cover thickness. An electromagnetic reflectivity is at a minimum within the primary region for a first incident angle and within the secondary region for a second incident angle being different from the first incident angle.
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